Allow setting application features in deployment

cf push コマンドから始め、issue にリンクされている Cloud Foundry v3 update-an-app-feature API を確認します。デプロイ時に要求された --features 入力をどのように表現すべきかを判断し、その後、cf push が再起動を必要とせずに、要求された機能を有効にした状態でアプリケーションを維持できることを検証します。

When doing a "cf push" I am able to add information such as a manifest using -f flag.
I would like to add a flag for application features -
https://v3-apidocs.cloudfoundry.org/version/3.195.0/index.html#update-an-app-feature
something like:
cf push --features '{"file-based-vcap-services":enabled}'

This is important as it's not something that is opened in the manifest.
although I think it should have been.

What's the user value of this feature request?
The developer using the CLI can push the application in a ready state without needing to do a restart.

Who is the functionality for?
Operations and developers that are using the cloud foundry platform.

How often will this functionality be used by the user?
Since we use blue-green deployment it will be used massively.

Who else is affected by the change?
There is no affect on whoever is not using the new flag.

Is your feature request related to a problem? Please describe.
The problem is that application features are not exposed in the manifest of an app, I can't change them using a manifest.

Describe the solution you'd like
cf push --features '{"file-based-vcap-services":enabled}'

Describe alternatives you've considered

Additional context
This feature request is related to the new binding feature: file-based-vcap-services which from my perspective should be also configurable in the manifest but unfortunately it's not.